If the door is a single object you can try static light generation with g3dit. Press button "B" at bottom.
Objects like size of a cupboards use static light data instead of lightmaps.
Create a light cache by pressing button "Cache erstellen".
Button "Aktuelle Beleuchtung" shows how many light sources are currently applied.
Button "Beleuchten" will apply new light sources.
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But you have to change the properties of your object, so that it uses static light data.
Take a look at a cupboard in property view "P" at class eCIlluminated_PS.
Change your door accordingly if it's a single object.